Automatic engine governor



Jan. 23, 1934.

W. A. ENGSTROM El AL AUTOMATIC ENGINE GOVERNOR Filed Sept. 12. 1931 AV/////V//// INVENTORS.

ATTORNEY.

Patented Jan. 23, 1934 AUTOMATIC ENGINE GOVERNOR William A. Engstrom and Earl Ginn, Detroit,

Mich

Application September 12, 1931 Serial No. 562,454

Claims.

Our invention relates to a new and useful improvement in an automatic engine governor adapted particularly for internal combustion engines and intended as a means for maintaining the op- 5 eration of the engine at a constant speed undervarying loads.

It is an object of the present invention to provide a governor of this class whereby the engine pulsations will be balanced out so that the device may be used where a somewhat intermittent flow of air is present.

Another object of the invention is the provision of a governor of this class whereby the engine pulsations will be delivered to both sides of a movable control actuating member.

Another object of the invention is the provision in a device of this class of a metering pin whereby a bleeding of air into the device to permit the operation of the actuating mechanism in re- 20 sponse to the suction of the engine may be effected. I

Another object of the invention is the provision of a governor of this class whereby the control valve will be operated under normal conditions gradually and under all conditions will be free from fluttering and vibration in its operation.

Another object of the invention is the provision of a device of this class which will be compact, durable and efficient in use, economical of manufacture, easily and quickly assembled and possessed of a minimum number of parts so that disarrangement of the various parts or likelihood of inoperativeness will be avoided.

Other objects will appear hereinafter.

- The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by a reference to the accompanying drawing which form a part of this specification, and in which,

Fig. 1 is a side elevational view of the invention, showing it installed.

Fig. 2 is a vertical, central, sectional view of the invention applied.

Fig. 3 is a view taken on'line 33 of Fig. 1.

Fig. 4 is a fragmentary sectional view, taken on line 44 of Fig. 2, slightly enlarged.

Fig. 5 is a fragmentary sectional view of a slightly modified form of the invention.

may be formed as an integral part of the car- The invention is illustrated in the drawing used;

buretor and connected in communication with the fuel conduit directly or indirectly through the carburetor, or formed as a part of the motor.

Mounted in the conduit 9' which communicates with the manifold 9 is a control valve 11 which is fixedly mounted on the rod 12. This rod 12 projects into a governor housing 13 having removable end walls 14 and 15 secured thereto. A bleeder. pipe 16 is connected in an opening formed in the end wall 15 and serves as a means for communicating the housing 13 at that end with the atmosphere. In the drawing we have illustrated the pipe 16 connected to the air conduit 17 which communicates with the carburetor 7 and in which is positioned the choke valve 10. Extending into the housing 13 is a rib 18 having a passage 19 formed therein. Thre (led into one end of the passage is the plug 22 aving the bore 23 formed therein, and a similar plug 24 with a bore 25 formed therein is threaded into the opposite end of the passage 19. This passage 19 communicates through the lateral passage 20 with the interior 21 of the conduit 9'. Slidably mounted in the housing 13 is the control member 26 which in the construction illustrated, is in the form of a piston. Projecting outwardly from'the central portion of the member 26 is a pair of spaced lugs 27 between which engages the pin 28 projecting downwardly from the crank 29 which is fixedly mounted on the rod 12. We have illustrated this type of connection between the movable control member and the control valve stem although it will appear obvious that various types of connections may be used.

A spring 30 engages at one end the end wall 14 and at its opposite end engages in a recess 31 formed in the face of the control member 26. Projecting outwardly from the opposite 'end of the control member 26 is a metering pin 32 which is secured to the member 26 by the set screw 33. This metering pin is cut away as at 34, and this cut away portion is projected into the plug 35 which is mounted in the opening formed in the end wall 15. An inwardly projecting flange 36 is formed on the member 35.

In operation, when the engine is started, the suction from the engine will produce a vacuum in the chamber 42 and likewise in the chamber 43. On. account of the bleeding into the chamber 43 of air, the vacuum in the chamber 43 will be reduced below the vacuum in the chamber 42 with the result that the control member 46 will move against the compression of the spring 30 to close the control valve 11. The metering pin 32 will be provided with a predetermined shape or size of recess 34 so that a predetermined amount of air may be bled into the chamber 43. Thus the pin 32 will serve to maintain, through a control of the air bled into the chamber 43, a predetermined pressure in the chamber 43 at a predetermined speed. Likewise the plugs 22 and 24 will have a predetermined size of bore 25 and 23 respectively therein so that the control valve 11 will be operated to always maintain the engine at a predetermined rate of speed regardless of the load. As the load is lessened or increased, the vacuum will be effected so that a further closing or opening of the valve will result.

We have shown the bleed relief in the chamber 43, but it is obvious that the bleed relief may equally as well be placed in the chamber 22 and the plug 24 made solid, leaving the chamber 43 freely open to the atmosphere.

With a device constructed in this manner, the pulsations are balanced out and the vacuum curve is fitted to a mechanical set up rather than a mechanical set up fitted to a vacuum curve. This change in the vacuum curve is effected by bleeding air or other suitable vacuum medium on the balanced side opposite the spring side or, where the plug 24 is formed solid, by bleeding the relief medium into the chamber 42.

In Fig. 5 we have shown a passage 20 which communicates the passage 19 with the interior 21 of the conduit 9'. This passage 20' is provided with the enlarged portion 38 in which is positioned the check valve 39 normally maintained in closed position by the spring 40 which engages the plug 41. This structure is particularly adapted for use on engines having but few cylinders.

In this device a lubrication of the movable member 26 is effected by leakage of the fuel into the housing 13.

While we have illustrated and described the preferred forms of construction of our invention, we do not wish to limit ourselves to the precise details of structure shown, but desire to avail ourselves of such variations and modifications as may come within the scope of the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. In a governor of the class described, a fuel inlet control valve; a housing; a movable member in said housing for operating said control valve, said member being spaced from one side of said housing to provide a chamber, said chamber being in communication with the fuel inlet conduit; a spring for normally resisting movement of said member in one direction, said member being movable in said direction in response to vacuum produced in said chamber; and a vacuum relief bleed mechanism for bleeding air into said chamber for maintaining a vacuum in said chamber in balance with the spring pressure for all positions of said movable member at a predetermined speed of engine operation.

' 2. In a governor of the class described adapted for use with an internal combustion enginehaving a fuel, a fuel inlet and a control valve: a cylinder forming h using; a piston slidably mounted in said cyl' der and-operatively connected with the control valve, said cylinder being connected to the fuel inlet, and said piston being movable in one direction in response to vacuum produced by the engine in said cylinder; resilient means for normally resisting movement of said piston in said direction; and a variable air relief bleed mechanism for bleeding air into said cylinder for maintaining a vacuum therein in balance with the spring pressure on said piston for all positions of movement of said piston at a predetermined speed of engine operation.

3. In a governor of the class described adapted for use with internal combustion engines having a control valve and a. fuel inlet: a cylinder in communication with said inlet; a piston slidably mounted in said cylinder and operatively connected with said control valve and movable in said cylinder in one direction in response to vacuum produced in said cylinder by the engine; a spring for resisting movement of said piston in said direction; and a bleed mechanism for bleeding air into said cylinder in variable volumes depending upon the position of the piston in the cylinder for maintaining a vacuum in the cylinder in balance with the spring pressure for all positions'of said piston at a predetermined speed of engine operation.

'4. In a governor of the class described adapted for use with an internal combustion engine having a fuel control valve and a fuel inlet: a cylin-- der; a communicating conduit for establishing communication between said inlet and said cylinder; a piston slidably mounted in said cylinder and operatively connected with said control valve for operating'the same/upon movement of said piston in said cylinde said piston being movable in said cylinder in one direction in response to thevacuum produced in said cylinder by the engine; resilient means for resisting movement of said piston in said cylinder in said direction; and a bleed relief mechanism for bleeding air into said cylinder for maintaining a vacuum in said cylinder in balance with the spring pressure for all positions of said piston at a predetermined speed of engine operation, the volume of bleeding and the pressure of said resilient means being coordinated relatively to each other and relatively to the area of the conduit.

5. In a governor of the class described adapted for use with an internal combustion engine having a fuel control valve and a fuel inlet: a cylinder; a conduit for establishing communication of said cylinder with said inlet; a piston slidably mounted in said cylinder and movable in one direction in response to vacuum produced in the cylinder by the suction of the engine; means for operatively connecting said piston to said control valve for operating the same upon the movement of said piston in said cylinder; a spring for resisting movement of said piston in said cylinder in one direction; and a bleed mechanism for bleeding air into said cylinder, the volume of air bled into said cylinder being variable depending upon' the position of the piston in the cylinder, the variation of said volume being coordinated to the spring pressure for maintaining a vacuum in said housing in balance with the spring pressure for all positions of said piston at a predetermined speed of engine operation.

- WILLIAM' A. ENGSTROM.

EARL GINN. 

